shell script to remove a file if it already exist

Question

Don't bother checking if the file exists, just try to remove it.

rm -f /p/a/t/h
# or
rm /p/a/t/h 2> /dev/null

Note that the second command will fail (return a non-zero exit status) if the file did not exist, but the first will succeed owing to the -f (short for --force) option. Depending on the situation, this may be an important detail.

But more likely, if you are appending to the file it is because your script is using >> to redirect something into the file. Just replace >> with >. It's hard to say since you've provided no code.

Note that you can do something like test -f /p/a/t/h && rm /p/a/t/h, but doing so is completely pointless. It is quite possible that the test will return true but the /p/a/t/h will fail to exist before you try to remove it, or worse the test will fail and the /p/a/t/h will be created before you execute the next command which expects it to not exist. Attempting this is a classic race condition. Don't do it.

Another one line command I used is:

[ -e file ] && rm file

You can use this:

#!/bin/bash

file="file_you_want_to_delete"

if [ -f "$file" ] ; then
    rm "$file"
fi

If you want to ignore the step to check if file exists or not, then you can use a fairly easy command, which will delete the file if exists and does not throw an error if it is non-existing.

 rm -f xyz.csv